x=1.25:1.25:10; y=[49.03,122.58,245.18,328.33,304.01,245.17,155.44,101.99]如何用matlab指数拟合?

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 3x+x+4y+(90+10)x=3y-(2x+y)+510y=34x 48X=Y 48(2X)=1.25Y {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 1.25X-7Y=165X加6Y=10错了是25X-7Y=1625X加6Y=10 化简求值:1/7(-2x+3y)(-2x-3y)-10乘以 (x+y)的平方,其中x=1.25,y=-0.25另: 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4y是怎么变成=2y(2x-y)÷4y 已知X、Y满足X平方+Y平方+1.25=2X+Y,求代数式XY/X+Y x+4y=9,x-4y=10 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 x+5y=4,2x+10y=? x+y=10,6x+4y=46 2x+4y=10 X*y=3 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= x²+y²+1.25=2x+y 求X与Y x+y=10 4x+2y 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 就是已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y /4y就是除以4y 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16